tetradymite

[te-trad-uh-mahyt]
noun
a mineral, bismuth telluride and sulfide, Bi 2 Te 2 S, occurring in soft-gray to black foliated masses.

Origin:
1840–50; < Greek tetrádym(os) fourfold (see tetra-, didymous) + -ite1; modeled on German Tetradymit

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World English Dictionary
tetradymite (tɛˈtrædɪˌmaɪt)
 
n
a grey metallic mineral consisting of a telluride and sulphide of bismuth. Formula: Bi2Te2S
 
[C19: from Late Greek tetradumos fourfold, from Greek tetra- + didumos double]

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Encyclopedia Britannica
Encyclopedia

tetradymite

a sulfide mineral of bismuth and tellurium (Bi2Te2S). It is commonly found in gold-quartz veins and contact-metamorphic deposits, as in Idu, Japan; Sorata, Bolivia; Boliden, Sweden; and Boulder county, Colo., U.S. Tetradymite is classified in a group of metallike sulfide minerals closely resembling each other in physical properties and in the hexagonal symmetry of their crystals. For detailed physical properties, see sulfide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Ternary tetradymite compounds as topological insulators.
Tetradymite is in the interstices of the rock-forming silicates.
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